API requests are literally just HTTP requests. You can can use any HTTP request library you like, such as fetch, or axios, or whatever. You just need to make the request to the endpoint you wish, with the required parameters and any optional ones as specified in the docs, and the required headers, and you’ll get back a response with JSON data.
The docs show an example:
curl -H 'Client-ID: uo6dggojyb8d6soh92zknwmi5ej1q2' \
-X GET 'https://api.twitch.tv/helix/streams?first=20'
This is the simplest way of showing a HTTP request that’s platform/language independent. It’s “Send a HTTP GET request, to the URL https://api.twitch.tv/helix/streams, with the first=20 querystring parameter, and the Client-ID: uo6dggojyb8d6soh92zknwmi5ej1q2 header.”
If you don’t yet have a Client ID, the Getting Started guide in the docs explains where to get one Twitch API | Twitch Developers